How to get elements with custom name from rss? - php

Question

I have the following rss format, and i can't eject the 'content:encoded' value.
<item>
<title>some title</title>
<link>some link</link>
<pubDate>Sat, 07 Apr 2012 5:07:00 -0700</pubDate>
<content:encoded><![CDATA[this value]]></content:encoded>
</item>
i wrote this function, everything works well except the 'content:encoded' field that give me this error: 'Notice: Trying to get property of non-object'
function rssReader($url) {
$doc = new DOMDocument();
$doc->load($url);
$fields = array('title', 'description', 'link', 'pubDate', 'content:encoded');
$nodes = array();
foreach ($doc->getElementsByTagName('item') as $node) {
$item = array();
var_export($node, true);
foreach ($fields as $field)
$item[$field] = $node->getElementsByTagName($field)->item(0)->nodeValue;
$nodes[] = $item;
}
return $nodes;
}

Answer 1

You need to use getElementsByTagNameNS instead of getElementsByTagName for 'content:encoded' tag:
foreach ($fields as $field){
if( $field == 'content:encoded' ){
$item[$field] = $node->getElementsByTagNameNS('contentNamespaceURI','encoded')->item(0)->nodeValue;
}else{
$item[$field] = $node->getElementsByTagName($field)->item(0)->nodeValue;
}
}
You could find 'contentNamespaceURI' in rss. There must be something like:
xmlns:content="contentNamespaceURI"

Answer 2

The Tag name here is "encoded".
Just use
$content => $node->getElementsByTagName('encoded')->item(0)->nodeValue